Double helicity asymmetry in inclusive mid-rapidity pi0 production for polarized p + p collisions at s**(1/2) = 200-GeV
- Adler, Stephen Scott
- Afanasiev, S.
- Aidala, C.
- Ajitanand, N.N.
- Akiba, Y.
- Al-Jamel, A.
- Alexander, J.
- Aoki, K.
- Aphecetche, L.
- Armendariz, R.
- Aronson, S.H.
- Averbeck, R.
- Awes, T.C.
- Babintsev, V.
- Baldisseri, A.
- Barish, K.N.
- Barnes, P.D.
- Bassalleck, B.
- Bathe, S.
- Batsouli, S.
- Baublis, V.
- Bauer, F.
- Bazilevsky, A.
- Belikov, S.
- Bjorndal, M.T.
- Boissevain, J.G.
- Borel, H.
- Brooks, M.L.
- Brown, D.S.
- Bruner, N.
- Bucher, D.
- Buesching, H.
- Bumazhnov, V.
- Bunce, G.
- Burward-Hoy, J.M.
- Butsyk, S.
- Camard, X.
- Chand, P.
- Chang, W.C.
- Chernichenko, S.
- Chi, C.Y.
- Chiba, J.
- Chiu, M.
- Choi, I.J.
- Choudhury, R.K.
- Chujo, T.
- Cianciolo, V.
- Cobigo, Y.
- Cole, B.A.
- Comets, M.P.
- Constantin, P.
- Csanad, M.
- Csorgo, T.
- Cussonneau, J.P.
- d'Enterria, David G.
- Das, K.
- David, G.
- Deak, F.
- Delagrange, H.
- Denisov, A.
- Deshpande, A.
- Desmond, E.J.
- Devismes, A.
- Dietzsch, O.
- Drachenberg, J.L.
- Drapier, O.
- Drees, A.
- Durum, A.
- Dutta, D.
- Dzhordzhadze, V.
- Efremenko, Y.V.
- Enyo, H.
- Espagnon, B.
- Esumi, S.
- Fields, D.E.
- Finck, C.
- Fleuret, F.
- Fokin, S.L.
- Fox, B.D.
- Fraenkel, Z.
- Frantz, J.E.
- Franz, A.
- Frawley, Anthony D.
- Fukao, Y.
- Fung, S.Y.
- Gadrat, S.
- Germain, M.
- Glenn, A.
- Gonin, M.
- Gosset, J.
- Goto, Y.
- Granier de Cassagnac, R.
- Grau, N.
- Greene, S.V.
- Grosse Perdekamp, M.
- Gustafsson, H.A.
- Hachiya, T.
- Haggerty, J.S.
- Hamagaki, H.
- Hansen, A.G.
- Hartouni, Edward P.
- Harvey, M.
- Hasuko, K.
- Hayano, R.
- He, X.
- Heffner, M.
- Hemmick, T.K.
- Heuser, J.M.
- Hidas, P.
- Hiejima, H.
- Hill, J.C.
- Hobbs, R.
- Holzmann, W.
- Homma, K.
- Hong, B.
- Hoover, A.
- Horaguchi, T.
- Ichihara, T.
- Ikonnikov, V.V.
- Imai, K.
- Inaba, M.
- Inuzuka, M.
- Isenhower, D.
- Isenhower, L.
- Issah, M.
- Isupov, Alexander
- Jacak, B.V.
- Jia, J.
- Jinnouchi, O.
- Johnson, B.M.
- Johnson, S.C.
- Joo, K.S.
- Jouan, D.
- Kajihara, F.
- Kametani, S.
- Kamihara, N.
- Kaneta, M.
- Kang, J.H.
- Katou, K.
- Kawabata, T.
- Kazantsev, A.
- Kelly, S.
- Khachaturov, B.
- Khanzadeev, A.
- Kikuchi, J.
- Kim, D.J.
- Kim, E.
- Kim, G.B.
- Kim, H.J.
- Kinney, E.
- Kiss, A.
- Kistenev, E.
- Kiyomichi, A.
- Klein-Boesing, Christian
- Kobayashi, H.
- Kochetkov, V.
- Kohara, R.
- Komkov, B.
- Konno, M.
- Kotchetkov, D.
- Kozlov, A.
- Kroon, P.J.
- Kuberg, C.H.
- Kunde, G.J.
- Kurita, K.
- Kweon, M.J.
- Kwon, Y.
- Kyle, G.S.
- Lacey, R.
- Lajoie, J.G.
- Le Bornec, Y.
- Lebedev, A.
- Leckey, S.
- Lee, D.M.
- Leitch, M.J.
- Leite, M.A.L.
- Li, X.
- Li, X.H.
- Lim, H.
- Litvinenko, A.
- Liu, M.X.
- Maguire, C.F.
- Makdisi, Y.I.
- Malakhov, A.
- Manko, V.I.
- Mao, Y.
- Martinez, G.
- Masui, H.
- Matathias, F.
- Matsumoto, T.
- McCain, M.C.
- McGaughey, P.L.
- Miake, Y.
- Miller, T.E.
- Milov, A.
- Mioduszewski, S.
- Mishra, G.C.
- Mitchell, J.T.
- Mohanty, A.K.
- Morrison, D.P.
- Moss, J.M.
- Mukhopadhyay, D.
- Muniruzzaman, M.
- Nagamiya, S.
- Nagle, J.L.
- Nakamura, T.
- Newby, J.
- Nyanin, A.S.
- Nystrand, J.
- O'Brien, E.
- Ogilvie, C.A.
- Ohnishi, H.
- Ojha, I.D.
- Okada, H.
- Okada, K.
- Oskarsson, A.
- Otterlund, I.
- Oyama, K.
- Ozawa, Kyoichiro
- Pal, D.
- Palounek, A.P.T.
- Pantuev, V.
- Papavassiliou, V.
- Park, J.
- Park, W.J.
- Pate, S.F.
- Pei, H.
- Penev, V.
- Peng, J.C.
- Pereira, H.
- Peresedov, V.
- Pierson, A.
- Pinkenburg, C.
- Pisani, R.P.
- Purschke, M.L.
- Purwar, A.K.
- Qualls, J.
- Rak, J.
- Ravinovich, I.
- Read, K.F.
- Reuter, M.
- Reygers, K.
- Riabov, V.
- Riabov, Y.
- Roche, G.
- Romana, A.
- Rosati, M.
- Rosendahl, S.
- Rosnet, P.
- Rykov, V.L.
- Ryu, S.S.
- Saito, N.
- Sakaguchi, T.
- Sakai, S.
- Samsonov, V.
- Sanfratello, L.
- Santo, R.
- Sato, H.D.
- Sato, S.
- Sawada, S.
- Schutz, Y.
- Semenov, V.
- Seto, R.
- Shea, T.K.
- Shein, I.
- Shibata, T.A.
- Shigaki, K.
- Shimomura, M.
- Sickles, A.
- Silva, C.L.
- Silvermyr, D.
- Sim, K.S.
- Soldatov, A.
- Soltz, R.A.
- Sondheim, W.E.
- Sorensen, S.
- Sourikova, I.V.
- Staley, F.
- Stankus, P.W.
- Stenlund, E.
- Stepanov, M.
- Ster, Andras
- Stoll, S.P.
- Sugitate, T.
- Sullivan, J.P.
- Takagi, S.
- Takagui, E.M.
- Taketani, A.
- Tanaka, K.H.
- Tanaka, Y.
- Tanida, K.
- Tannenbaum, M.J.
- Taranenko, A.
- Tarjan, P.
- Thomas, T.L.
- Togawa, M.
- Tojo, J.
- Torii, H.
- Towell, R.S.
- Tram, V.N.
- Tserruya, Itzhak
- Tsuchimoto, Y.
- Tydesjo, H.
- Tyurin, N.
- Uam, T.J.
- van Hecke, H.W.
- Velkovska, J.
- Velkovsky, M.
- Veszpremi, V.
- Vinogradov, A.A.
- Volkov, M.A.
- Vznuzdaev, E.
- Wang, X.R.
- Watanabe, Y.
- White, Sebastian N.
- Willis, N.
- Wohn, F.K.
- Woody, C.L.
- Xie, W.
- Yanovich, A.
- Yokkaichi, S.
- Young, G.R.
- Yushmanov, I.E.
- Zajc, W.A.
- Zhang, C.
- Zhou, S.
- Zimanyi, J.
- Zolin, L.
- Zong, X.
Publication date
October 2010
DOI Publisher
American Physical Society (APS)Abstract
We present a measurement of the double longitudinal spin asymmetry in inclusive pi^0 production in polarized proton-proton collisions at sqrt(s)=200 GeV. The data were taken at the Relativistic Heavy Ion Collider with average beam polarizations of 26%. The measurements are the first of a program to study the longitudinal spin structure of the proton, using strongly interacting probes, at collider energies. The asymmetry is presented for transverse momenta 1-5 GeV/c at mid-rapidity, where next-to-leading order perturbative quantum chromodynamic (NLO pQCD) calculations describe the unpolarized cross section well. The observed asymmetry is small and is compared with a NLO pQCD calculation with a range of polarized gluon distributions
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